Power-transmitting device.



N0. 653,636. Patented July 10, I900. D. ASHMAN.

PDWEB TRANSMITTING DEVICE.

(Application filed Jan. 86, 1900.) (No Model.) 2 Sheetr-Sheet l.

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No. 653,636. Patented July l0, I900.

- D. A'SHMAN.

POWER TRANSMITTING DEVICE.

(Application filed. Ian. 25, 1900.) (No Model.) 2 Shae'ts-Shaat 2,

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NITED STATES PATENT Genres,

DAVID ASHMAN, OF BALTIMORE, MARYLAND, ASSIGNOR TO EAGLE MANUFACTURINGCO.

POWER-TRANSMITTING DEVICE;

SPECIFICATION forming part of Letters Patent No. 653,636, dated July 10,leoo.

Application filed January 25; 1900. Serial No. 2 735. (No model.)

To all whom it may concern.-

Be it known that 1, DAVID ASHMAN, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improvements in Power-Transmitting Devices,of which thefol lowing is a specification.

This invention relates to mechanism for transmitting power todrive-wheels, especially designed to actuate sewing or other machineswhich are usually propelled by means of pedals. I

Referring to the drawings, Figure 1 is a section view, in sideelevation, of a m achine-frame equipped with my improvements. Fig. 2 isa view in front elevation of the same. Fig. 3 is an interior view of theclutch. Fig. 4 shows two views of the clutch-cap. Fig. 5 is. adiametrical section view of the clutch.

Two upright stands A A are secured to a vertical rectangular frame B byscrews or bolts, the frame constituting a brace for the structure. Afender C for the drive-wheel is also secured to the rectangular frame onone side and projects on the outside of the stand A. The top brace-rod aof the frame B has three downward-projecting lugs b 5 b and an arm orbracket 6 is supported by the top brace and side of the frame.

A horizontal shaft D is parallel with the top of the frame and has oneof its ends revoluble on a pivot-bearing c at one side of the frame B.The other end of the shaft passes through the opposite side of the frameand the stand and is revoluble on another pivotbearing a in the fenderG. Keyed to one end of this shaft outside of the upright stand A andinclosed by the fender is a drive-wheel F. Two friction-clutches G G aremounted securely on the shaft D between its ends. Two swingingtreadle-arms d d are used. Each of these arms has a pivot-bearing e e,the one in the downward-projecting lugs 12 b and the otherin thedownward-projecting lug b and the side of the bracket h The treadles areprovided with pedals f f. Each treadle near its upper end is providedwith a frame g g, which curves concentric with the pivot bearings e e,and the upper and lower edge within the frames is provided withratchetteeth 1' i. Each friction-clutch G G consists of a circular diskprovided with a circumfer ential wall h, and a hub h projects on eachside of the disk concentric with the wall and has a bore h to take overthe shaft D, to which it is secured by a set-screw h A collar Z has alug m and takes loosely but closely around the hub h within the disk,and pivoted to the lug is a clutch-pawl having at one end a lip n,projecting beyond the lug and which impinges by frictional engagementthe inner surface of the circumferential wall of the disk when thelatter is turned by the shaft in the direction of the arrow; but when itis turned in the opposite direction the lip 12 will be released fromfrictional engagement with said wall and the disk may be turned free ofthe lip n. The pawl also has at the other end a tongue 01 An L-shapedarm 0 is pivoted at o to this end of the pawl, so that the shorter endof the arm is parallel with the said tongue n and leaves a spacebetween. The longer end of the arm 0 is connected bya spiral spring r toan ear Z on the collar Z. This spring normally draws on the L-shaped arm0, so as to compress or grip a pin which passes into the space, as willpresently be described. The cap of this clutch device consists of acircular plate P, which is loose on the shaft D and revolves against thewall it of the disk and on one side of which is a cogged hub 19,concentric with the circumference of the plate and is provided with anend shoulder 19. The other side of this plate has a projecting pin 15,which passes into the said space between the tongue 01, and the arm 0 toactuate the clutch-pawl within the disk when the cogged hub is turned bythe movement of the frame, and the pin is held compressed between thetongue and arm 0 by the tendency of the spring 4". This arrangementprevents the pin 25 from rattling within the said space, and the springalso serves to return the clutch-pawl to its normal impinging positionagainst the wall of the disk when it has been thrown out of suchposition by the backward movement of the pin t on the cap when thelatter is rotated reversely. This cap is held in place by a collar 10,secured to the shaft by a set-screw u and which bears against theshoulder 10 to hold the cap up to the wall of the disk. One series ofteeth only, either t or i, of the curved frames 9' g" engage the coggedhub on the cap P to turn the latter right and left. When the cap isturned to the left, the pawl will impinge frictionally on the innersurface of the wall of the disk and cause said disk and shaft D torotate, the disk continuing to revolve while the cap-plate P and pawlare brought back by the reversed swinging movement of the concentrictooth-frame to reimpinge the said wall.

In machines manufactured at the present time some are built to run inone direction only and others in the reverse direction only. This isparticularly true of sewing-machines as used in factories. For thisreason it is desirable that driving mechanism for such machines shall beprovided that is reversible, so as to be adapted to be attached tomachines that are intended to run in opposite directions. The mechanismof this clutch is there fore reversiblethat is, may be taken out of thecup-shaped disk and set in again in reverse position, so as to impingethe wall of the disk either right or left, as desired. The curved frame9 is adjustable upon the treadlearm by means of slots jj and screws 7t7t, (shown in Fig. 1 by broken lines,) so as to allow the upper seriesof teeth z'of the frame to take down on the cogged hub or the lowerseries i of teeth to take up under the hub, as desired.

The operation is as follows: The treadlearms 01 cl, carrying theconcentric frames 9' g, are oscillated rearward and forward alternatelyin order that the positive actuating effect of the frames upon thecogged hubs of the clutches may be difierential in respect to eachother, so that when one treadle is forced forward it will cause theframe secured thereto to rotate the cogged hub and cap I, and.

the pin on this cap will push the clutch mechanism and cause it toimpinge the wall of the disk and rotate the latter and the shaft. Thusthe momentum acquired in the forward rotation of the shaft anddrive-wheel will be retained until succeeded by the positive action ofthe clutch operated by the other treadle, which will cause thecontinuous motion of said shaft and wheel.

Having thus described my invention,what I claim as new, and desire tosecure by Letters Patent, is

1. In clutch mechanism for transmitting rotary power, the combination ofa supporting-frame; a rotary shaft supported in said frame and carryinga drive-wheel; a cupshaped friction-disk on said shaft between its ends;a cap, P, loose on said shaft and closing the cup-shaped disk andprovided on one side with a'cog by which it is driven and on the otherside with a pin which projects into the said cup-disk; a clutch-pawldevice which may be placed in reverse positions within said cup-shapeddisk and be actuated by the said pin, whereby the position of theclutchpawl maybe reversed within the cup-disk and the shaft may bedriven in one direction or the other.

2. In a friction-clutch for power-transmitting mechanism to rotatedrive-wheels, the combination of a shaft carrying the drivewheel; a diskhaving a circumferential wall, 72', and which is secured to a shaft; aloose collar, Z, having a lug, m, clutch-pawl, n, pivoted on said lugand at one end having a lip, n, to impinge by frictional engagement theinner surface of the circumferential wall, a tongue, 17. on the other;an L-shaped arm, 0, pivoted to said pawl and forming a space between itand said tongue; a cap, P, loose on said shaft having a pin, 25, whichtakes into the said space; and a spiral spring, 7, connecting the saidarm with the collar and serving to compress or grip the said pin, t, inthe space.

3. The herein-described reversible rotary mechanism consisting of thecombination of a supporting-frame; a rotaryshaft supported in saidframeand carrying a drive-wheel; cup= shaped friction-disks on saidshaft; reversible clutch-pawl mechanism within said cup-disks; a caploose on said shaft and provided on one side with a cog and on the otherside with a pin which engages the reversible pawl mechanism; andtreadles swinging in said frame and each having two racks one of whichto engage the cog on said loose cap to turn the cap in one direction,and the other rack to engage said cog to turn the cap in the oppositedirection when said clutch-pawl mechanism has been reversed in thecup-disk.

In testimony whereof I ailix my signature in the presence of twowitnesses.

DAVID ASHMAN.

W'itnesses:

CHARLES B. MANN, J r., CHARLES L. VIETSCH.

